JP2015223897A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more securely prevent a seat belt webbing from turning around to the back side of a seat back.SOLUTION: A seat belt webbing 21 is drawn out toward the inside almost in a vehicle width direction from a drawing port on a vehicle body inner side surface at the rear side of a seat back 1, and a tip end part thereof is fixed to a side part of a seat cushion. When the seat back 1 stays in a standing position and a seat belt is not worn, a shoulder corresponding part 21a in the seat belt webbing 21, positioned above a shoulder part of the seat back 1, is in a state of being inclined at a first inclination θ1 so that a vertical interval of an outer side part in the vehicle width direction with the seat back 1 is larger than that of an inner side part therewith. A vehicle width direction inner surface of a seat belt guide 32 is formed to be an inclined surface 32a inclined at a second inclination θ2 so as to become lower toward the vehicle width direction inner side, and the second inclination θ2 is set to be larger than the first inclination θ1.

Description

  The present invention relates to a seat belt device.

  As a seat in which the seat belt device is used, there is a seat that includes a seat cushion and a seat back, and the posture of the seat back can be changed between a standing position and a lying position where the seat back is tilted forward. In such a seatback that can be laid down, a lock mechanism (generally configured by a latch and striker) is configured to lock between the vehicle body and the rear side of the seatback when in the standing position. It has come to be.

  The seat belt webbing of the seat belt device used for the above-described seat is pulled out from the rear of the seat back toward the front of the vehicle interior, and then the front end thereof is fixed to the side portion of the seat cushion. In such a configuration, the seat belt webbing exceeds the shoulder portion of the seat back when the seat back in the standing position is laid down in the seat belt non-attached state and then laid down and then set to the standing position again. There is a risk of moving around to the back side of the seat back while moving toward the inner side of the vehicle body.

  If the seat back is placed in a standing position with the seat belt webbing wrapping around the back, the seat belt webbing may be sandwiched between the seat back and the vehicle body, or in extreme cases, the seat back may be bitten by the seat back locking mechanism. Will end up. In Patent Document 1, a seat belt guide that protrudes upward is provided on the shoulder portion of the seat back in the standing position, and the seat belt webbing that is pulled out from the rear of the seat back toward the front of the vehicle interior is provided on the shoulder of the seat belt. What has been disclosed is to prevent the vehicle from moving to the inner side of the vehicle body beyond the part.

JP 2011-178288 A

  In the seat belt guide described in Patent Document 1 described above, the seat belt guide has a shape that stands almost straight upward. However, in this case, once a part of the seat belt webbing gets on the top part (upper end part) of the seat belt guide, the seat belt webbing then passes over the seat belt guide and moves to the inner side surface of the vehicle body, thereby It will be easy to go around to the back side of.

  The present invention has been made in view of the circumstances as described above, and an object of the present invention is to provide a seat belt device that can more reliably prevent the seat belt webbing from turning around to the back side of the seat back. It is to provide.

In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1,
A seat belt device used for a seat whose posture can be changed between a standing position and a lying position where the seat back is lying forward,
The seat belt webbing is pulled out inward in the vehicle width direction from the inner side surface of the vehicle body behind the seat back and then extended downward, and the tip end thereof is fixed at a low position on the inner side surface side of the vehicle body. And
When the seat back is in the upright position and the seat belt is not attached, the shoulder corresponding portion located above the shoulder portion of the seat back of the seat belt webbing is such that the outer side in the vehicle width direction is from the inner side. Is also in a state of being inclined at the first inclination angle so that the vertical interval with the seat back is increased,
When the seat back is in the upright position and the seat belt is not attached, a seat belt guide for restricting movement of the shoulder corresponding portion toward the outside in the vehicle width direction is above the shoulder of the seat back. It is provided to protrude toward the
The inner surface of the seat belt guide in the vehicle width direction is an inclined surface inclined at a second inclination angle so as to become lower toward the inner side in the vehicle width direction,
The second inclination angle is set larger than the first inclination angle;
It is like that. According to the above solution, when the seat belt webbing is going to move outward in the vehicle width direction while changing the posture of the seat back from the lying position to the standing position, the seat belt webbing comes to the inclined surface of the seat belt guide. It is prevented from moving to the outside in the vehicle width direction by being in close contact. As a result, it is possible to reliably prevent the seat belt webbing from turning around to the back side of the seat back.

A preferred mode based on the above solution is as described in claim 2 and the following claims. That is,
A seat belt anchor through which the seat belt webbing is inserted is provided in the vicinity of a shoulder portion of the seat back on the inner surface of the vehicle body,
The seat belt webbing is directed downward after passing through the seat belt anchor.
(Corresponding to claim 2). In this case, the seat belt webbing in the lower part than the seat belt anchor is set so as to extend downward substantially along the inner surface of the vehicle body. However, when such setting is performed, the seat belt webbing is performed. Thus, the first inclination angle is generated, and the seat belt webbing can easily get over the seat belt guide when the seat back is tilted forward. However, according to the above solution, it is possible to reliably prevent the situation where the seat belt webbing wraps around the back side of the seat back.

  The seat belt guide has a solid structure as a whole with an upward projecting portion (corresponding to claim 3). In this case, the seat belt guide is formed as a simple structure as much as possible to reduce the cost. This is preferable in terms of reduction.

  The seat belt guide has a recess recessed from the inner end in the vehicle width direction toward the outer side in the vehicle width (corresponding to claim 4). In this case, while changing the posture of the seat back from the lying position to the standing position, the seat belt webbing is caused to enter the recess so that the seat belt webbing more reliably wraps around the back of the seat back. This is preferable for prevention.

The seat belt guide has a vertical wall portion that extends substantially vertically upward, and a folded portion that is folded from the upper end of the vertical wall portion toward an obliquely lower side in the vehicle width direction. The inner surface in the vehicle width direction is the inclined surface,
The concave portion is formed by setting the lower end position of the folded portion to a position higher than the lower end position of the vertical wall portion.
(Corresponding to claim 5). In this case, a specific structure of the seat belt guide constituting the recess can be provided. Further, in the middle of changing the posture of the seat back from the lying position to the standing position, it is possible to expect the action of pressing down the seat belt webbing by the lower end of the folded portion, and the effect corresponding to claim 1 can be more fully exhibited. This is preferable.

  According to the present invention, it is possible to reliably prevent the situation where the seat belt webbing wraps around the back side of the seat back.

The front perspective view which shows one Embodiment of this invention and abbreviate | omits a seat belt anchor and shows the arrangement | positioning state of a seat belt webbing. The front perspective view which shows the state which abbreviate | omitted the seatbelt webbing from the state of FIG. The rear perspective view which shows the relationship between the seat back frame in a standing position and a vehicle body. The top view which shows the relationship between the trim material which comprises the vehicle body inner surface in the vicinity of a seat back, and seatbelt webbing. The perspective view which shows an example of the guide member by which the seatbelt guide was comprised. The figure which looked at the guide member of FIG. 1 from the front. The left view of FIG. The principal part front view which shows the relationship between the inclination-angle of a seatbelt webbing, and the inclination-angle of a seatbelt guide. The front view which shows another example of a guide member and was seen from the front.

  In FIG. 1, reference numeral 1 denotes a seat back, which shows a state of a standing position extending upward from a rear portion of a seat cushion (not shown). The seat back 1 can take a lying position that has been fallen forward from the standing position shown in FIG. FIG. 3 shows the frame 2 of the seat back 1. A known locking mechanism for locking the frame 2 (seat back 1) in the standing position between the frame 2 and the vehicle body side surface portion 10 immediately behind the frame 2 at the position indicated by A in FIG. (For example, it is composed of a latch provided on the frame 2 side and a striker provided on the vehicle body side).

  As a vehicle having the seat back 1 whose posture can be changed between the standing position and the lying position described above, for example, a wagon car or a one-box car is used, but the rear seat has a left and right divided structure of, for example, 6: 4. It can also be a sedan type vehicle. In the embodiment, a small vehicle (small hatchback type) in which the height of the seat back 1 in the vertical direction is relatively low is applied.

  A three-point seat belt device 20 is provided for the seat back 1, and the seat belt webbing is indicated by reference numeral 21. The seat belt device 20 will be described. First, as shown in FIGS. 1 and 2, a drawer port 10 a of the seat belt webbing 21 is formed at the rear of the seat back 1 in the standing position in the vehicle body side surface portion 10. ing.

  A retractor 22 is fixed to the vehicle body on the vehicle width direction outer side of the vehicle body side surface portion 10. A seat belt webbing 21 pulled out from the retractor 22 extends from the pull-out port 10a into the vehicle compartment. The seat belt webbing 21 is pulled out into the vehicle interior from the drawer opening 10a toward the inside in the vehicle width direction. The seat belt webbing 21 passes through the seat belt anchor 23 (see FIG. 4) attached to the vehicle body side surface portion 10 in the vicinity of the shoulder portion of the seat back 1 in the standing position, and then extends along the vehicle body side surface portion 10. Extending downward, the front end portion is fixed to the side portion of the seat cushion (the lower portion of the vehicle body side surface portion 10 or the passenger compartment floor in the vicinity thereof), and this fixing portion is indicated by reference numeral 24 in FIG. A tongue 25 is slidably attached to the seat belt webbing 21 between a seat belt anchor 23 and a fixed portion 24. A tongue engaging portion (not shown) is fixed to the vehicle body at a low position near the inside of the seat cushion in the vehicle width direction, and the tongue 25 is detachably engaged with the tongue engaging portion. (Securement of 3 points when seat belt is worn)

  When the seat back 1 is in the upright position and the seat belt is not worn, the seat belt webbing 21 is disposed so as to pass directly above the shoulder of the seat back 1 (shoulder close to the vehicle body side face 10). A portion passing above the shoulder is indicated by reference numeral 21a as a shoulder corresponding portion. As shown in FIG. 8, the shoulder-corresponding portion 21a has a lower position in the vehicle width direction outer side portion so that the vertical distance from the seat back 1 is larger than the inner side portion (inward in the vehicle width direction). As described above, the state is inclined at the first inclination angle θ1. The first inclination angle θ1 is a small angle of about 10 degrees to 20 degrees with respect to the horizontal line H. In addition, an inclination line at the first inclination angle θ1 passing through the shoulder corresponding portion 21a is indicated by a symbol α. As described above, such a state is likely to occur when the seat belt webbing 21 is drawn into the vehicle interior substantially inward in the vehicle width direction and extends downward via the seat belt anchor 23.

  A guide member 30 is fixed to a shoulder portion of the seat back 1, that is, an end portion on the vehicle body side surface portion 10 side of the upper surface portion of the seat back 1. The guide member 30 is positioned below the shoulder corresponding portion 21a.

  Details of the guide member 30 are shown in FIGS. The guide member 30 is an integrally molded product made of synthetic resin and has a holding hole 31. When the pressing button 40 is slidably fitted and held in the holding hole 31 and the pressing button 40 is pressed, the locking mechanism described above is unlocked.

  A seat belt guide 32 that protrudes upward is integrally formed at the end of the guide member 30 on the side surface 10 of the vehicle body. The seat belt guide 32 has a solid structure as a whole in the upward protruding portion. That is, the guide member 30 includes a solid seat belt guide 32 and is an integrally molded product made of a synthetic resin, which is preferable for inexpensive formation.

  The seat belt guide 32 has an inner surface in the vehicle width direction as an inclined surface 32a. As shown in FIG. 8, the second inclination angle (angle formed with respect to the horizontal line H), which is the inclination angle of the inclined surface 32a, is indicated by θ2 in FIG. The second inclination angle θ2 is set as a large angle in a range of 30 degrees to 60 degrees, for example, and is an angle sufficiently larger than the first inclination angle (10 degrees to 20 degrees). An inclination line at the second inclination angle θ2 passing through the inclined surface 32a is indicated by a symbol β. When the seat back 1 is in the upright position and the seat belt is not attached, the upper end portion of the seat belt guide 32 is almost directly below the outer end portion in the vehicle width direction of the shoulder portion corresponding portion 21a of the seat belt webbing 21. Located in.

  In the above-described configuration, consider a case where the seat back 1 is changed from the standing position to the lying position and returned from the lying position to the standing position again. At this time, if the seat belt guide 32 is not present, the seat belt webbing 21, particularly the shoulder corresponding portion 21 a portion, is in contact with the vicinity of the shoulder portion of the seat back 1 that is in the process of returning to the standing position. In response to the force toward the outside in the direction, it tries to wrap around the back of the seat back 1.

  The seat belt webbing 21 that is going to wrap around the back of the seat back 1 comes into contact with the seat belt guide 32 in the middle thereof (see the dashed line in FIG. 8), and is brought into close contact with the inclined surface 32a (first). The posture is changed so that the angle of 1 inclination angle θ1 becomes larger), and it is prevented from moving outward in the vehicle width direction from the seat belt guide 32 (around of the back of the seat back 1) Prevention). Incidentally, when the seat belt guide 32 does not have the inclined surface 32a and is almost upright, the seat belt webbing 21 easily moves from the state where the seat belt webbing 21 rides on the upper end of the seat belt guide to the outside in the vehicle width direction. There is a risk of it.

  FIG. 9 shows a modification of the guide member. The guide member 50 in the present embodiment is an integrally molded product made of synthetic resin as a whole, and has a holding hole 51 (corresponding to the holding hole 31 in the embodiment) and a seat belt guide 52. The seat belt guide 52 includes a vertical wall portion 52a that extends substantially straight upward, and a folded portion 52b that is folded obliquely downward inward in the vehicle width direction from the upper end of the vertical wall portion 52a. An inner side surface in the vehicle width direction of the folded portion 52b is an inclined surface 52c (corresponding to the inclined surface 32a in the embodiment). The inclination angle of the inclined surface 52c is the second inclination angle θ2 described above, which is sufficiently larger than the first inclination angle θ1.

  The folded portion 52b is relatively short. That is, the lower end position of the folded portion 52b is sufficiently higher than the lower end position of the vertical wall portion 52a. Thereby, the recessed part 53 dented toward the vehicle width direction outer side from the vehicle width direction inner side edge part is formed under the folding | returning part 52b.

  In the present embodiment, when the seat back 1 is returned from the lying position toward the standing position, the seat belt webbing 21 is brought into close contact with the inclined surface 52c of the seat belt guide 52, thereby preventing the seat back 1 from turning around to the back side. Is done. In particular, the seat belt webbing 21 is brought into close contact with the inclined surface 52c and is subjected to the action of entering the recess 53, so that the seat back 1 is further prevented from wrapping around the back side. In addition, when the seat belt webbing 21 enters the recess 53, the hooking action by the lower end of the folded portion 52b is also exerted, and the seat belt webbing 21 turns around to the back side of the seat back 1. Is more reliably prevented.

  Although the embodiments have been described above, the present invention is not limited to the embodiments, and appropriate modifications can be made within the scope of the claims. The seat belt guide 32 (52) may be formed integrally with the seat back 1. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

  The present invention is preferable in preventing the situation where the seat belt webbing wraps around the back side of the seat back.

1: Seat back 2: Frame 10: Car body side surface portion 10a: Drawer port 20: Seat belt device 21: Seat belt webbing 22: Retractor 23: Seat belt anchor 24: Fixed portion (tip portion of seat belt webbing)
30: Guide member 31: Holding hole 32: Seat belt guide 32a: Inclined surface 40: Operation button (for unlocking)
50: Guide member 51: Holding hole 52: Seat belt guide 52a: Vertical wall portion 52b: Folded portion 52c: Inclined surface 53: Recessed portion θ1: First inclination angle θ2: Second inclination angle

Claims (5)

A seat belt device used for a seat whose posture can be changed between a standing position and a lying position where the seat back is lying forward,
The seat belt webbing is pulled out inward in the vehicle width direction from the inner side surface of the vehicle body behind the seat back and then extended downward, and the tip end thereof is fixed at a low position on the inner side surface side of the vehicle body. And
When the seat back is in the upright position and the seat belt is not attached, the shoulder corresponding portion located above the shoulder portion of the seat back of the seat belt webbing is such that the outer side in the vehicle width direction is from the inner side. Is also in a state of being inclined at the first inclination angle so that the vertical interval with the seat back is increased,
When the seat back is in the upright position and the seat belt is not attached, a seat belt guide for restricting movement of the shoulder corresponding portion toward the outside in the vehicle width direction is above the shoulder of the seat back. It is provided to protrude toward the
The inner surface of the seat belt guide in the vehicle width direction is an inclined surface inclined at a second inclination angle so as to become lower toward the inner side in the vehicle width direction,
The second inclination angle is set larger than the first inclination angle;
A seat belt device characterized by that. In claim 1,
A seat belt anchor through which the seat belt webbing is inserted is provided in the vicinity of a shoulder portion of the seat back on the inner surface of the vehicle body,
The seat belt webbing is directed downward after passing through the seat belt anchor.
A seat belt device characterized by that. In claim 1 or claim 2,
The seat belt guide has a solid structure as a whole with an upward protruding portion.
A seat belt device characterized by that. In claim 1 or claim 2,
The seat belt device according to claim 1, wherein the seat belt guide has a recess that is recessed from the inner end in the vehicle width direction toward the outer side in the vehicle width direction. In claim 4,
The seat belt guide has a vertical wall portion that extends substantially vertically upward, and a folded portion that is folded from the upper end of the vertical wall portion toward an obliquely lower side in the vehicle width direction. The inner surface in the vehicle width direction is the inclined surface,
The concave portion is formed by setting the lower end position of the folded portion to a position higher than the lower end position of the vertical wall portion.
A seat belt device characterized by that.

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